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Is there a noun for investment funds which do not disclose the assets they are investing in to their customers?

Hedge fund?

Other than 13F filling requirements( US specific) I don't really know any that make their entire book public to their investors.

But to directly answer the question I haven't heard of a term that is meant to describe this. It just happens to be that almost all hedge funds are as secretive about their holdings as possible until its in their best interest to make it public ala the olive garden break stick manifesto

$\begingroup$I understand that hedge funds do not disclose their portfolios in public, I was referring to not disclosing their holdings/investment strategy to their customers.$\endgroup$
– emcorAug 25 '15 at 22:47

$\begingroup$@emcor, sorry for the late reply but manyh hedge funds don't disclose their holdings or strategy to their clients.$\endgroup$
– chollidaSep 17 '15 at 13:52